Ticket #7293 (closed defect: fixed)
VirtualBox-3.2.x-OSE - guest performance issues with guest kernels >=2.6.32
|Reported by:||Polynomial-C||Owned by:|
I have set up some Gentoo guest systems running on a Gentoo-host machine (kernel-126.96.36.199 at the time of filing this bug) with eight CPU-cores (2x AMD Opteron 2389, AMD-V is activated). The guests all have four CPUs assigned to them and I don't run more than one of these VMs at the same time.
I observed two problems on the guest machines:
As soon as I am using kernel-2.6.33 or newer in the guest systems they completely freeze after a short period of I/O traffic (like some rsync command or untarring a bigger archive).
When sticking with kernel-2.6.32.x in the guest systems the VM does not freeze but after some bigger compilation sessions (you know, in Gentoo you compile quite a lot ;)) the performance decreases drastically. To give you an example in numbers: Compilation of www-client/seamonkey usually takes about 15 minutes using all four assigned CPU-cores. When this performance decrease occured comilation of the same package takes over two hours still using all four CPUs. htop in the guest shows the CPUs utilized at 100% but htop in the host systems shows that the assigned CPUs only get utilized at roughly 55%-60%.
Please let me know what more information you need. I can attach the kernel .config file from either kernel-2.6.32.x, kernel-2.6.33.x, kernel-2.6.34.x and/or kernel-2.6.35.
- Status changed from new to closed
- Resolution set to fixed
- Status changed from closed to reopened
- Resolution fixed deleted